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Get back on the road with the highest-rated interlock device.

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By clicking the button, you consent to Consumer Safety Technology, LLCConsumer Safety Technology, LLC brands include Intoxalock, Keepr, DUI.org, DUICare and its affiliate Breathe Easy Insurance Solutions, LLC calling and texting at the telephone number provided, without regard to the time of day, to encourage the purchase or lease of DUI-related products and services, including through the use of automated technology, artificial voice and/or pre-recorded means. Consent is not a condition of purchase. For California residents, click here.
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Intoxalock Ignition Interlock Device

What is a Car Breathalyzer?

Why You Should Buy a Car Breathalyzer for Responsible Driving

A breathalyzer for car ignition (also known as an ignition interlock device, IID, BAIID, car breathalyzer, or interlock system) is a device that attaches to the starter of your vehicle and requires you to submit breath samples in order to start your vehicle. The breath samples taken by the IID will measure your breath alcohol concentration (BrAC) and allow you to start your vehicle if you pass the car breathalyzer test.

Depending on the state you are required to install your ignition interlock system in, the amount of BrAC that prevents your auto breathalyzer from starting your vehicle will vary. For more information on what are the ignition interlock device requirements in your state, visit our state requirements page.

View State Requirements

How Does a Car Breathalyzer Work?

So, how does a car breathalyzer work? In order to start their vehicle, people with an Intoxalock interlock or car breathalyzer installed must:

  • Press the button to activate the device.
  • Once the device indicates it is ready, use the blow-inhale-blow breath pattern to submit their breath test
  • Await results. Once they have passed, they will be able to start their vehicle.
  • If they fail the test, they will be unable to start the vehicle until they pass, and the device may lock them out for a time before allowing a retest.

How Much Does a Car Breathalyzer Cost?

The cost of your car breathalyzer will vary based on multiple factors, including the type of vehicle you install the IID device into and the length of time you are required to have it. For more information on the cost and pricing of car breathalyzers, visit our ignition interlock cost page.

Taking a BrAC Test

Each ignition interlock provider has unique breath requirements. For example, users of the Intoxalock blow-inhale-blow device devices simply blow into the device for 1-2 seconds, inhale for another 1-2 seconds, and finish with a final blow lasting 3-4 seconds. In contrast, other IID devices may require longer test durations or different blow patterns, such as humming within a defined frequency range while blowing.

Installing Your Breathalyzer for Car Ignition

Intoxalock Ignition Interlock makes the interlock breathalyzer installation process simple and convenient by offering the most car breathalyzer installation locations nationwide.

If you are required to install an IID, call 833-905-3484 today to schedule an installation appointment near your home or work.

Calibrating Your Car Breathalyzer

Depending on the state you received your offense in, you will be required to get your car breathalyzer calibrated every 30-90 days. A calibration requires going to one of your provider's service centers and having the technicians check to make sure that your interlock device is working correctly.

Can You Buy an Ignition Interlock Device?

You cannot purchase an ignition interlock device. Car breathalyzers must be leased through approved interlock providers, like Intoxalock, for the duration of your monitoring period. IID devices sold online may be stolen or uncertified, jeopardizing your compliance with state requirements.

Need an Ignition Interlock Installed? 877-272-5195

We Can Help!

Solicitud de contacto en Espanol

By clicking the button, you consent to Consumer Safety Technology, LLCConsumer Safety Technology, LLC brands include Intoxalock, Keepr, DUI.org, DUICare and its affiliate Breathe Easy Insurance Solutions, LLC calling and texting at the telephone number provided, without regard to the time of day, to encourage the purchase or lease of DUI-related products and services, including through the use of automated technology, artificial voice and/or pre-recorded means. Consent is not a condition of purchase. For California residents, click here.

How Do Car Breathalyzer Retests Work?

Some may be tempted to try and cheat the car breathalyzer by having a sober friend take the test. However, this can backfire quickly. To ensure continuous sobriety, many states require random car breathalyzer retests during a trip. The process for a retest is the same as the starter test, the only difference being that the car has already been started. The device will warn you before a test is due, to allow time to pull over if needed. Most breathalyzers give you a few minutes to accomplish this. You will use the same blow-inhale-blow breath pattern on each test and retest.

Facts About Random Retests
Close-up of an Intoxalock ignition interlock device resting on the center console of a car.

Intoxalock Ignition Interlock – A Simple-to-Use One-Button Activated Car Breathalyzer

Intoxalock simplifies the entire interlock breathalyzer process for you. Here are some of the many reasons why choosing Intoxalock as your IID provider will make your ignition interlock journey feel like a breeze:

  • More installation locations than any other provider
  • Easy-to-use device (one button, no humming)
  • Excellent customer service available 24/7
A man using an Intoxalock ignition interlock device in a car, preparing to take a breath sample.
Call Us Anytime at 877-272-5195
Intoxalock devices are court-approved and state-compliant. Talk to a state specialist today for step-by-step assistance.
Intoxalock devices are court-approved and state-compliant. Talk to a state specialist today for step-by-step assistance.